[Marwan]

glow, i have a slightly different suggestion for you to consider, instead of using dynema as shooting line try monofilament, in my opinion its much better, get the 1.6mm mono from spetton and the spetton crimps, you will also need a crimping tool (all three of these items are sold at subprof.com) I would imagine that dave (spearo.co.uk) would also have a similar solution..
for the wishbone, picasso sells dynema wishbones that would directly fit on threaded bands (no tools needed), they also sell that at subprof.com..
i would recommend a third option try the beuchat tahiti wishbone (also sold at subprof) this is my favourite, its metal so engages the spear notches very well, its not articulated (no hinges), its not sharp (i could easily grip it when loading), its also designed in a way that when loaded, it keeps the bands slightly to the sides so you easily remove your fingers out of the way...i find this the safest and most reliable option...
best of luck